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Gentiv Ultra They
have to be strong because the force of the muscle(s) which act on them have to
be able to take the full burden of the muscular force when the muscle
contracts. Imagine running down the street as fast as you can. The amount of
strain your calf muscles puts on your achilles tendon is immense; not only
that, but it is also indirectly helping to support the weight of your body at
the same time that this intense force is being applied.